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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b0b58bd2b77cdbd4cbe6f54cbf57df1258e9e337ad589f3755c586f45d60ef2' 
  AND token = 'vk6DhRLuaXIKs6yxAoWDCXp3fiQdj+iVopS9zoJJc6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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