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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef60d0c61cd0393daa5793b4c5cd8b07895725daa3aa088c2569a78332e33e3' 
  AND token = 'Ynymwza8m6budUL3CTwzGH+U+66L/1FVKWbkhXg2yug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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