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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f7f041a995322bdae8cbdea0d09cda574a741faf9bf75b83755e9b2fc4e19c8' 
  AND token = 'w6weRMNzsRkOdApIdumCsKjJte0U3nN+2I98haADckI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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