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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08f635929a5ac21cafc64cc4f4685f2ae249842a7c1937b8ab6f8cb6d0a4476' 
  AND token = '5W6lmmtHLTahrFCufpugyCp2cTQZAh8xrqyQhPhgjZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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