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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28de1f2e5513d58574422f9615cca9a719e79da788f4c8dde6b22fddff74791b' 
  AND token = 'vBYxJpXfSMOl7VxiIOxcKJ8z4a0t7eiGxUGk99ymUWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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