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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4f4a27400f19a2c96bc1c412a888c41684e496edf849e7a3f0975c6bd7ad482' 
  AND token = 'lL3JPkBA3odYppC23CYOvoQB9xQmq2tv7fjK+m7btzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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