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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968bd1697887503a8cd317498d77d5ae03d10adb5a41269e6492468653dc0f3e' 
  AND token = '6FvmSRgCT8mN+ZK/mpP7SUp5rdaWEKKR3w+UWeUS8J0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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