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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b37167d2d84469229da24a7d11aa2f43ecceb56199d618f70715516c410112' 
  AND token = 't8rUD7/kNstXiPpXkDuDjCK++KVmgZ8A9iNcyyuMw5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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