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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b4c082d6b78df44690b5cc703e8d528301f6eb07cad4a48a2bb03d59dcba03' 
  AND token = 'WY8CKkxAV8a0jaxI56i0lQ35lNWHdceSiLPbUbyliDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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