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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828aab3a05b094cfce9b4e2a0a10d29a31b5067d57c2160084cb22810eae15db' 
  AND token = 'NsXW8JxsB26okS7zeec9AiP7MmgbgbCXQfgwUHMGf+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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