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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77fc1318350cf204d25581fb260df4e5039077029e2bf2478e8c8733d6d03f9' 
  AND token = 'H16I4xhuY2vxWo79v7TiSsHKYu85V9I7KQLW6ZN5bC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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