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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6197cf0a38d3816188ce2f66ac3a2fb30426f1a26d2f5261e90a7126ead54529' 
  AND token = 'AQZKcemVY3FK3kkCIhO6mI5F1rg41VWX5uhprYfBcwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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