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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f7847021bc0217cbd5e901b4970fb8687c9a799ac3c4847e1ab43ac75ba937c' 
  AND token = 'dESoEhi47xCddaBL8BQmqucUPnsuyiiHOmn5Bbf4xZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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