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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e1c53f2411c3103635d8a4d384120b7a13949fb9d6c71a4373dfaf501fb141' 
  AND token = 'p3TttwDLnkxxjG0mLZl+xu87XLHNOtUzPXifbkL1tJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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