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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0af3069ae9e36fcefcd465c038d040c0cf787815beed2d897d02a763b2430d0' 
  AND token = 'soiSTIA7wP3T7d1yhLSoRbJ17r7y+B1Czt/sLVivxH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}