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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99ff5106af7646600c756557a230ef5dcee08ae4d81b4aed99c95252953665e' 
  AND token = '2lHMOZXeNSC5Em3uGx6Ifl6vW1CIUin2FdUaw+J3F08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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