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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098feaf829411bfbfbd94b5b893b9d247688281be7553f783487b45d56bdf271' 
  AND token = 'nMoFFA8B4qRfEOyqVPZeqhdnFToI06GZRsUskz0yALs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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