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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07de167eb61673d782568defa36dbc74f1c91a560e8a189d9e3da9947992855e' 
  AND token = 'yUeJxDM+6o3EZWLIU5a7s3nzRQQkSqc9xdKX7GJQfjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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