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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3372c3650678c57c9132c3beabe83ac5be2531ff65cc88b1356ca4ccd10e007' 
  AND token = 'z8nrytK6FC2AU+zQQAamyepxYD49wIB6S8DjCK1X5Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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