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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b554a303fde1e622cdd992f0bc47bccfa15af9136f91c9b722260625399fcc2' 
  AND token = 'Kkkb9x8MJqJy9/fJdcSfOyfkr2Ko3r1X+JUvCe210jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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