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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92838fc50072ee5d5eab8a5a21b98322974c2147fd6da435fb3b63fde6b1ecc' 
  AND token = 'ah5vLUO4z5fmQI590uwpDUFE4ynmjl7GgCp18LXk34g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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