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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b9b9428e2c7de666a89571509ec9ce01341a44280f3e5a133a29e9e23dc45b' 
  AND token = 'o/bJolB9ZtFACVpFACoOVUMN6FRfmKWRzlzKLaS1HlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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