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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402238cb83fd07047e73dbd72d3d51801c6aa9bf1c70f86753c39b67d5b50015' 
  AND token = 'nlGFvzQaIBNNi3QDYhLuLE8k7ET5es3jlcP7Zyy0hX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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