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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135d6fd92797cd8282437c01099926807106e8fb00e5a105100c275c0ed0fd4d' 
  AND token = 'dTkywKIRAPNvlBa7Y3Gg8QiEV+VfWpDBzGe1iMesaHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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