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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c3302f8d8c6ab615bd970df03a4ac91f8e6ff0d651f2e2685931a93e16e60ca' 
  AND token = '/unDDNx4MAtriYmq8yjSL9ovXsjpshDjpenp/+2xryM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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