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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58805c790299b50906560739f7d724dd498d9a6a4da5a89793b8e9bc9221ee55' 
  AND token = '6ChqKiRy3VQgwy1FA9rrGtWS3VwWQd0NPLvwsY22xLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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