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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cf4e2ace7a6caea10468a175f5088eda87b289fbad8adeed39d08608f25152' 
  AND token = '/N6u6lJMHQp/s2mrebuGAAF+PXgN0H8DNecO54+BFrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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