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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a1f8c063f6c5c91145febf44a6f187652ca1066b1908591d34b98d5ed398ee' 
  AND token = '1zoFQMIxeP5PTqgJ3fAKJhVeBkzo+R/Dc9OuDi12osY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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