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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e13e1a7bfab882120a3ff26c1c5c96dda00fbe4518ee477bfd8e6decde08dca' 
  AND token = 'ua8HoXq3Nfu0RYf79xN9Yfc+GVjP7F7HjOnHaQWL6lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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