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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1526f6dbef431d8e11c69a5c182c17c7b60a7dea081d6edfc74dda571cca00f7' 
  AND token = '+NQRaJ7n7RsWmKvaRdsWS6eD1HO61KXLeaqYuSCBJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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