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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cde482af07fa089d20275b8ea33034411c35f0d6fe3db83436ed0f09909007a7' 
  AND token = 'W3asZGZANk+0TV+yuM2O9hYj65D1g7P4qugAxmdubW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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