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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11d2bdae5b1f57fe2fde857e60d719055d180f1eb3eb45980919945cda2494d' 
  AND token = '2ORlSR78CsETl4TrHgY6OG2y6ENBRdiWd+BFLCFJ5GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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