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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879833da8dee7cdbfdb5527b3c3a010ae697510973f9c4417137139830775062' 
  AND token = 'eeok4Qp4Ia4/l3zxQN6QklBmZBomTEfoPwrB3hAWpFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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