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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4c7f2b25473569088cb414be4336712508582101d01d263739a55b7426adc87' 
  AND token = 'Fld7aBqcDUO62cMhn1uOQ8XcR+AgmJ+pMXNdLeWANUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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