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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589fe6ce4e62acfd3769ccf6449d5fd42d76c4868dad3adc91be54bce62b1a4d' 
  AND token = '3A0GLFzwcqPKPGCoiw++kvkEr/mGx4oD9yPiz6hWDX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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