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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2675a2b1eefcbd6889cc45aa3ae35f0ba087f8de8fb9f2d4835f9c37133a5b7d' 
  AND token = 'Dqx8ZsA68KQFLWz9YzHm2egtJGAVcT9ABdQG2YSVbNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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