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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe067caf96569f2f806b93a2fd620efd8eb4acf873f47fef0ae1648001e1771f' 
  AND token = 'x+I/drZe18zSUNwstBnb8JcRmK3NkpbaSLeoBv1aTEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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