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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9551940272204efc3023352c2e6740c4af280f07a0c26f467977ec2f3ca3906f' 
  AND token = 'A6xFtO7Wru/miVJF7VRTC4nln1JhQukxMAdg+cOJKEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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