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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '958949f68a931be05b0c3708e95be58c9fcbae3ded04927a391c5f349f7bd68b' 
  AND token = 'cVmOHGPZ1Yi1TbdHF6YJuAOs4muDSHpLCnCQa5+QOgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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