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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3909c4d8fd3ab101bee0f1d5c0f58a66dc50cdd28764f8da6f4f561302ddfe' 
  AND token = 'e7/ySQErfcao6t8GwS0N+SMd03Oy/mVwmRxiNbKX1nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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