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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad98be32a9637e31ea0ca59de6279f37cc97f9a64387bd2a56da40421f5e0ce3' 
  AND token = 'VzZEew/Z1KWUmENxr6Q5GUML0GlUMWwHiUoe2s7OrqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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