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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19cdf29a51106d96c1e1330800d5b7f3f9430dbd1f02b80b32bb99fc88826d6' 
  AND token = 'vkzJh3uNxa0+R2W+607nLaJ01BZTE/74GProkwV+doY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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