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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b78d93ffac5191a92740967833ae978a6736ea6469e18115342388ad5064a6b' 
  AND token = 'Ngt5YSImRt1/EJ4XrjxFbYBG8TXucy40fXcRBgsk33Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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