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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6da4941d3b6dd63d633d9ab33d4a2e429373c7578c1b6a6f319b6b1d7a1c54ae' 
  AND token = '2e6MSbyvGZBRsEYzaljfc0dbR4hAnJPFEwKbKmaJPy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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