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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb67a3749c43187764503286e710e42d8bb21a8e145cc65e50deb2b7ea0e4b5e' 
  AND token = 'rapG1osSfP4r4/v6eyvBK6d8UiosKJHvKpnW6xGzGyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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