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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199b42cf3238a5e0095ba38d2d90eb042f5c8b71ab80af2a2ad08b81a17365a9' 
  AND token = '5L2J2I0YtJkt2IY1CbrJpd/FRV7fLibcFbuFIuGp21Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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