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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1919c5f53a1419544f902d613a6aff87168171964381c6140fe87357dff977' 
  AND token = '8v87Hic/hDaXe76islO3GdQcIbsr4KlSjdtdJuU0mmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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