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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ff87295a111342cc0fa9196ae81f4a452b78520e7a8b5ee6b5695cb467b29b' 
  AND token = 'sxwN+aopO8RtyOAqxlZZCaGxRZUd4A+8R7tbaAK3jOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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