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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '664e820974774624236c89c0aaa56efcb2a9cafc4ec579a038854bcb698e43be' 
  AND token = 'oX8nnSLZa6wXmCpWhA5ZfRMoNRyQAsL8EHjhBABS+4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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