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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce12d31684658184c5c433e902fa6349044bf9da4baaa67c5a8c0011f2b69b45' 
  AND token = 'rcw9B9MTyPUQg2Vuol59klnvgqQHc936/n7Vd6Ye0yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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