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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3d33eac70a21d1d3ce76d5aa3c92352fc687a02b175f49e5ba12c19ded57eb4' 
  AND token = 'pie2xoMJ+5nxZKOjcv8tWP0TND1KwWJdE7T1CEo43oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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