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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7948e07939601d550d1772642ebe9787335079c179dbf1e4d72abdd4d94231fc' 
  AND token = 'U90/emLTMHQAGHW4QyKtGhkgJy0s6UOW1Toz7kz5wsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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