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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873933d192a78befd33b9976638a5013fe81d6282bc4e866d3b5576273952566' 
  AND token = 'ySVoNgQjoLB1HuMrBjPxaSY87RnzHT5Sg/6zEykihtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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