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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e099cd0568589bab7577a08939b6536bc90fb83d6a6177af79184c902b49ef69' 
  AND token = 'iUmqHC2b08CICBmTGI7g+D1DlZkIx3MEx3v3eAZT9vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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