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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b831770c6fc85378d732f00032076e24459e19dd5efc17acb7afe8c945c0df7c' 
  AND token = 'dMtt2A1UcHHK1WdbPvE42lq5DippI6UIo0eJaQdD4eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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