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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ab93ce243d49629389f1159b7936b77816425a4aca6a17c0d4ccc452c83ef7' 
  AND token = '2WsX1fmZqnHEAASSpBDQbVYIGVna9gWkGgZgN94KGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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