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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1ffb5ede4a11555a1059534461222dafb9e3e68eb5935d98ea8dbbb3cecac5' 
  AND token = 'ylFmCQ6S/rHZ3dX1icyxFGeXlOKu4ZHsqDl7r5jdP7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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