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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28cea8e8ffb2138688a2231519ba397e0b02eac01fd422598be74e9c57324757' 
  AND token = 'PlTEVf/QlcS11xH7Ts7c3LFHVnx2fkUeq7AffWVjnio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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