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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c0803191ef6bbd3ccaea2b5f5ec0880417a1062ba5f0747689c0ea8c9d4dd5c' 
  AND token = 'FMo5z54eymuCTbAnJoQu0q9u1KIqhkMY7EZVDf18Bfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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