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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d65090f633374cb13667573fa6c850268ec2e83bd8acb4089dd3371e42a89ec' 
  AND token = 'WCpfgY3sjpNxhptIYMPPv9QZAXRuMZTQzPkSA3o6r6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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