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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a3166661e7527cdaa8a73f5875a3947cc39833b8d3bb9df8fb75ff172854a9' 
  AND token = '+90Wtp4jUTcijlK3HeN4NdCa1a2zD50xTpzXY87hHZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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