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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cf2990f1705ad2070647516c352d49a6d588922447040dbb44bcbbb3d553cf' 
  AND token = '0uVKIHhB5N0JHbd1aPJHOY5eYx2DQUDTQBRBncbkMDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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