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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5f7e61fb0d83ca966fec495b91e33180e565d17c9e819e5b8ab765161ceed7' 
  AND token = 'b5jfGY4JiZ6F7iK0ECl6YZoQDcQgD0lQwYunayj4SyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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