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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d88ea7257400529280c5626e1c16e5668a24c632cea19309816da58760b88db' 
  AND token = '6v6XfvHk9lmT1sRQj28PSA4GXDmFwv+BadWgshRnKJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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