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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3469132e6184648655ab48bb4d24c29fd56f052b68f890aece18004a59e38d' 
  AND token = '9YNXkLVlZI8vkdjM4vA7SuaCL6p6rgiAh1AOCYSVlEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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