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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b7a2920ce78cdc281d6f28fd31970f7ba6f9c028a213b32ba409a4fc5c902' 
  AND token = 'j7kuoxP4f3IwwN+icy931gAh7JZodkSh0pA9BNJvcFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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