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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf7f867fdcf90cf9aaa27167c017bffb03ccc5b0184a5aa491d1e32ecb002d07' 
  AND token = 'Lr9Bk4cbVExGHnpVa6xLHHrf+J4nxjTiwU7dvYFDJ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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