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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f7bdb72f2c78b6234f4d6bec8009ea145b71986dde98950f6db92999877748' 
  AND token = 'dMyw1jJfyps/YI6rtmWzyefMbgypxLzCdmreI3glzYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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