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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edae9795f781b7971840ca5d49ca6ffcde64f617d77d2cced0efabc87a883831' 
  AND token = 'uwl/RlCql1vJwNgNn2F8Wq7xEhTe2x3ZsmYzdbkPhSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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