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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68a2a59bee47901652d81384acc63f98906cdca761437e76bda55eebc3b3659' 
  AND token = '7EBwsZPpVmlYQV2MRS3zjoYvidjlXzt7jb3anu0k0I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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