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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb129781f9f6ae1d96844fad9025526ca036115355db9811adf5fb9c108c826f' 
  AND token = 'j/eG4cjoQPeH4iWQ7V++3GPQD2kwoJmB7tVsX8Vbmkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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